Adjustable punch and die.



Patented May 11, 1915.

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` CHARLES c. GLADWIN, E NEW YORK, N. Y.

ADJUSTABLE PUNCH AND DIE.

Lieaaeo.

Specification of Letters Patent.

application mea November is, 1914. 'serial No. 872,704.

To all whom it may concern:

a citizen of the United States of America,

residingat New York city, borough of Manhattan, county and State of New York, have invented certain new and useful Improvements in Adjustable Punches and Dies, of which the following is a full, clear, and exact description.

This invention relates to an improvement in sheet metal punches and dies, the object being to provide a tool of this character that is specially adapted for use Iin coilnection with metal conduits for electrical wiring. It often happens that it is impossible to secure the conduits `for electrical conductors to a wall or ceiling in .the position selected, owing to the presence of an obstruction to the passage of a screw and consequently other screw-holes haveto be made in the metal conduit. y

My improved punch is especially adapted to produce screw-holes without taking the conduits down from the wall or ceiling.

I will now proceed to describe my invention in detail, the novel features of which I will point out in the appended claims, reference being had to the accompanying drawing, forming part hereof,wherein- Figure 1 is a side elevation of my improve punch; Fig. 2 is an enlarged view of the jaw-end of the punch, broken away to show the punch and die; Fig. 3 is a plan view showing the die for the punch, and, Fig. 4 is a sectional plan view, the section being taken on a line 3 3 in Fig. 2.

As herein embodied, my improvedlpunch and die consists of a-handlb 1 provided with a slot ormouth 2 for receiving the metalv to be punched. The 'upper jaw-member 3 is provided with a punch 4 and the lower jawmember 5 with `a die 6. 'The punch 4 may be of any desired shape, the opening in the die being made to conform Ito the shape of the punch 4.v

To guide the punch, Iwprovide the jawmember 3 with an adjustable block 7 through which the punch 4 passes. The block 7 is adjustable in the sense that it can be rotated and held in any one of a number of adjusted positions by a set-screwf8. In

this instance the block 7 is provided with a plurality of recesses 9 adapted to receive the set-screw 8. In a similar manner the through the hole.

die 6 `is'made adjustable, it being provided with a plurality of recesses 10 adapted to receive the end of a set-screw 11.

As can be seen in Fig. 2 the punch 4 is carried by a spindle 12 rotatably heldin a threaded post 13. The post 13, when rotated, will vmove longitudinally of the threaded opening 14, thereby raising or lowering the punch 4,l according to the direction of its rotation.

The spindle 12 carries two collars 15 and 16 which rotatably secure the said spindle in position in the post 13. To facilitate the rotation of the post 13, I provide the same with a squared head 17.

The punch 4 herein illustrated is designed to punch a hole and communicating slot, the slot serving to receive thev shank. of the screw after thek head has been passed That portion of the punch which forms the holey is illustrated Patented May' Ti, i915.

by 184and that portion which formsthe slot Y is indicated by 19, the opening in the die 6 being made to correspond.' I

As both the punch4 and die 6 are adjustable, or rotatable, theycan be turned to punch the slotto lie in any one of the positions represented by the recesses9 and 10 in the block 7 and die 6. Hence the holes and slots can be punched in the metal of electrical conduits so as to permit the conduit to be secured in a desired position even though the screw-holes are not centrally located therein. For instance, the holes can be punched out of center of the conduit, but the slots can be centrally located, or the slots and holes can both be centrally located, the slots being -directed longitudinally of the conduit, or the openings can be punched to cause the slots to-be positioned at an angle relative to the center line of the conduit. v

The punch is forced downwardly by the rotation of the post 13, a wrench or other tool being used to rotate the'spindle. With the form of punch herein illustrated, I can `readily and eiiiciently produce screw or rivet ,openings commonly used in metal conduits employed in electrical work.

Having now described my invention, what 'I claim and desire to secure by Letters Patent, is:

A handle bifurcated to form a pair of jaws, in combination with two disks notched peripherally at corresponding intervals and adapted to be turned in said jaws respectively, one of said disks constituting a die and the other a punch guide, screws engaging independently of each other the peripheral notches of said disks, a punch Working through said die and shaped to be turned by the rotary adjustment of said guide, and

means for moving said punch endwise through said guide Without turnin it.

Signed at New York city, N. this 14 day of November, 1914.

CHARLES C. GLADWIN. Witnesses: n

MAURICE BLOCK, EDNA E. NATHAN. 

